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Abraxas is a sci-fi-sounding name with earthly possibilities, but some playground challenges.

Acacius is a Latinized form of the Ancient Greek Akakios and can be interpreted to relate to the same root as the name Acacia, for the thorn bush, or Akakios which means "not evil." With the modern taste for ancient names that end in "us," this obscure but attractive choice may have a chance of new life. Acacius is the name of three early saints.

Alaric is an ancient regal name that sounds modern enough to be considered. Alaric was a traditional name for the kings of the Ostrogoths, the most famous of whom was Alaric I, the King of the West Goths who sacked Rome in 410.

Quirky cool Arlo is now well and truly back. Last year it broke into the US Top 200 boy names and consistently ranks among the most popular boy names on Nameberry.

Variant of Brunhild, still clad in heavy armor. Though the heroine Brunhilda of Quentin Tarantino's recent film Django Unchained may have given this version of the name new appeal.

Spelled with either one 'l' or two, Calista came to the fore in 1997 when Calista Flockhart hit it big as Ally McBeal. Flockhart, who bears her mother's middle name, didn't just introduce a name, she introduced a whole sensibility. Pretty and delicate, Calista is definitely worthy of consideration, especially for parents with Greek roots.

Casimir, a traditional name of Polish kings, could do quite well these days as we see the rise of Caspian, Cassius, Castiel, et. al. Like Leopold and Laszlo, Casimir is strong and worth considering if you've got an adventurous streak — and bet your son will too.

Cassius, a Shakespearean name rooted in antiquity, is trending in a major way. It's one of a raft of Cas-starting names for both boys and girls, including Caspian, Cassian, and Cassia, that are enjoying a new moiment in the sun.

Pronounced klaus, this spelling of the name is associated in this country with the major Pop Art sculptor Swedish-born Claes Oldenburg, known for his colossal public sculptures of everyday objects such as lipsticks and binoculars, and the "Happenings" performance art of the 1960s. Variations include CLAUS, KLAUS, KLAES, and CLAAS.

Cyra is an unusual name that can be pronounced either SEER-a or SI-ra, rhyming with Keira or Tyra. This name may be a feminine variation of Cyrus but is also a Persian name that stands on its own. One noted bearer is writer Cyra McFadden.

Decimus is one of the Roman numeral names used in large Victorian families--in this case for the tenth child. It is now seeing some new life thanks to the cutting-edge fashion for ancient Roman names.

A punchy modern Cornish name derived from a place name, which is of disputed origin. It is sometimes said to derive from a rare Welsh name, Maeldaf, plus dinas, the Cornish for "fort". Another theory is that it comes from Cornish ty "house" plus malsai "eel" – likely a reference to Cornwall's fishing trade.

This form of Theodoric, familiar via Marlene, is a possible German import. It is an Anglicized ancestor of Derek and all its variations. A noted bearer was acclaimed classical German baritone and conductor Dietrich Fischer-Dieskau, and there have been Dietrichs in Henry James's The Princess Casamassima,/em and more recently on the TV show Psych.

This name, used in many Eastern European countries including Serbia and Romania, has two possible (and equally lovely) meanings. The feminine version is Dragomira.

Drusilla is an ancient Roman name, (probably) borne by descendants of Antony and Cleopatra, and is one of the 'illa' names that are ready for a comeback, especially with its cute short form Dru.

If you're looking for a Welsh name less common than Dylan, Griffin, Evan, or Morgan, you might want to consider this offbeat epithet of the wise wizard Merlin.

Root name Ambrose is an ancient saints' name derived from the Greek ambrosia, the food and drink of the gods that conferred immortality.

Think the letter X is always cool in names? Meet Eudoxia. An ancient name with a great meaning, associated with a number of saints and Byzantine royals, Eudoxia nonetheless sounds, to modern ears, more like the name of a skin disease or industrial solvent than a cute little girl. If you love it for some reason, variant spelling Eudocia might be a better bet.

Eunice is a New Testament name of the mother of Timothy, long associated with one of the Kennedy sisters, the founder of the Special Olympics. As high as Number 106 in the early 1900s, it lasted on the list until 1995. Eunice was the birth name of Nina Simone, which gives it a modicum of cool.

Flavius is an ancient Roman family name associated with a dynasty of emperors. It has an appealingly flavorful first syllable, and is the name of a stylist in the Hunger Games series.